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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script>
        //js的数据类型有哪些？
        // 1.String 字符串 加引号'',""
        // 2.Number 数字
        // 3.Boolean 布尔值 true,false
        // 4.Null 空对象
        // 5.Undefined 未定义
        // 6.Array 数组 [1,2,3,4,5,]
        // 7.Object 对象 { name:"zhangsan",age:18,sex:"男" }

        
        // 8.Symbol 唯一
        // 9.Int 超大数字


        var a = "js网页的脚本语言，只能执行在浏览器当中"
        var f = "798798798";
        var g = "true"
        console.log(a);
        // 内存 ==> 栈  和  堆？
        
        var b = 456465465465
        var h = 3.145
        var h = -3.145
        var h = 3e5
        var c = [1,"aaa",true,[1,2,3,4],{name:"zhangsan"}]

        var k = true;
        var l = false;

        let d = "iuuiuiiuii"
        d = 46546548

        console.log(d);
        // e = 79789789;
        // console.log(e);
        
        const e = 3.1415936;
        // e = 565756767568;
        // console.log(e);
        
    </script>
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